The 8 things you should never do in a fast-food restaurant, according to former employees

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Insider asked a group of individuals who used to work at fast-food chains about some of the most frustrating things they wish customers would stop doing.

Not knowing what you want before ordering can hold up an entire line.

Using the bathroom without buying something is often considered to be rude.

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Fast-food restaurants are convenient for grabbing a quick bite, but there are certain behaviors you may want to avoid the next time you pick up some fries.

Insider spoke to a group of individuals who used to work at fast-food chains to figure out some of the most frustrating customer behaviors and habits.

Here are eight things you should never do in a fast-food restaurant. Not knowing what you want before ordering can hold up an entire line.

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Rodney Aeria, a content producer at HUSTLR and former cashier at a major fast-food chain, told Insider that one of the most irritating things a customer can do is to wait until they reach the cashier to decide on their order.

"Customers who don't decide on what they want before it's their turn and hold up others behind them can be annoying for cashiers. While there are a few customers who give way while deciding, those who hold the line up don't just annoy the staff, but the other customers waiting in line," said Aeria.

Staff members oftentimes notice when you fill up your free water cups with soda, which is not cool.

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You may think you're being sly by asking for water and filling the cup you're given with soda, but restaurant staff usually catch on right away.

"Customers like to try and bypass paying for soft drinks by making free water cup requests, but this won't make you any friends amongst the staff. You'll likely be asked to pay for your drink if we see you," Beverly Friedmann, a content manager who used to work at a major fast-food chain, told Insider.

Of course, workers don't always have time to call out those who sneak soda into their tiny cups. Friedmann said that even if the store is very busy and staff members aren't able to confront you, they're definitely judging you.

Using the bathroom without buying something is often considered to be rude.

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If you regularly slip into a fast-food restaurant just to use the bathroom, the staff will definitely start to notice.

"It's one thing to have an emergency, but it's another to use the bathroom without purchasing something when paying customers are waiting longer than they should have to," said Friedmann. "This also creates additional work for staff doing maintenance jobs and headaches all around."

Friedmann told Insider that if you find yourself ducking into the same eatery regularly to use the bathroom, workers might appreciate it if you occasionally buy something small or donate your spare change to any charity collection drives they may have going on.

Read More: I tried cheeseburgers from 4 fast-food chains and there was a clear winner

See the rest of the story at Business InsiderSee Also:14 foods you shouldn't leave Italy without trying12 stars you probably forgot were in 'Anchorman'What it's like to cook for Kate Middleton and Prince William, according to celebrity chef Giada De Laurentiis

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